CN102162729B - Method for measuring included angle between laser emission axis and mechanical datum plane based on cubic prism - Google Patents

Abstract

The invention provides a method for measuring the included angle between a laser emission axis and a mechanical datum plane based on a cubic prism, belonging to the technical field of space optical communication. The invention aims to measure the included angle between an emission optical axis and a mechanical datum plane of a space optical communication terminal. The method comprises steps as follows: the cubic prism is bonded on the mechanical datum plane; an autocollimator is used for emitting a laser beam; the laser beam is reflected to the front reflection plane of the cubic prism by a transflector; the reflected beam of the cubic prism is ensured to coincide with the incident beam so as to determine the axis of the mechanical datum plane of an optical communication terminal to be detected; the beam reflected back by the cubic prism is transmitted by the transflector, is gathered by a long focal length lens to form a point image on a CCD (charge-coupled device) detector, and the first light spot position reading of the CCD detector is recorded; and then a laser is controlled to output a beam, the beam is gathered by the long focal length lens to form a point image on the CCD detector, the second light spot position reading of the CCD detector is recorded, and the included angle is calculated according to the readings. The method is used for measuring the included angle between laser emission axis and the mechanical datum plane of the optical communication terminal.

Description

Measuring method based on the Laser emission axle and the mechanical reference surface angle of block prism

Technical field

The present invention relates to a kind of measuring method of Laser emission axle and the mechanical reference surface angle based on block prism, belong to the space optical communication technical field.

Background technology

The beam divergence angle of space optical communication terminal is minimum, the sensing control accuracy requires height, so in the development process of space optical communication system, the accurately measurement of angle between the reference field of the emission optical axis of optical communication terminal and optical communication terminal machinery carrying platform.Present most of optical system requires not strict to the differential seat angle between optic axis and mechanical axis, need not measure difference therebetween, therefore still lacks the measuring method to angle between space optical communication terminal emission optical axis and the mechanical reference surface at present.

Summary of the invention

The objective of the invention is for the emission optical axis of measurement space optical communication terminal and the angle between the mechanical reference surface, designed a kind of measuring method of Laser emission axle and the mechanical reference surface angle based on block prism.

Measuring method of the present invention is:

Block prism is adhered on the mechanical reference surface of tested optical communication terminal; Make the front-reflection face of block prism parallel with the mechanical reference surface of tested optical communication terminal; Adopt autocollimator emission laser beam, make said laser beam after semi-transparent semi-reflecting mirror reflection, incide the front-reflection face of block prism, through the angle of adjustment autocollimator; Folded light beam and its incident beam through the reflection of the front-reflection face of block prism are coincided, determine the mechanical reference surface axis of tested optical communication terminal;

The light beam of said block prism reflected back is through the semi-transparent semi-reflecting lens transmission, and assembles the back through long focus lens and on ccd detector, become a some picture, writes down the facula position reading first time of ccd detector, and closes autocollimator;

Control the Laser Output Beam of tested optical communication terminal then, the output beam of said laser instrument becomes some picture, the facula position reading second time of record ccd detector on ccd detector after long focus lens is assembled;

Twice facula position reading according to ccd detector calculates, and emission shaft and the said mechanical reference surface that obtains tested optical communication terminal Laser Output Beam is at the angle of azimuth direction with at the angle of pitch orientation.

Advantage of the present invention is: the inventive method utilizes block prism, autocollimator, long focus lens and ccd detector accurately to determine the emission axis of tested optical communication terminal mechanical reference surface axis and Laser Output Beam; And then accurately drawing the angle between the emission axis of mechanical reference surface axis and Laser Output Beam, its precision is superior to 0.1 μ rad.

The inventive method measuring accuracy is high, adult is low, is easy to realize in the development process of space optical communication system, having great using value.

Description of drawings

Fig. 1 is the method synoptic diagram of the mechanical reference surface axis of definite tested optical communication terminal;

Fig. 2 is the measuring method synoptic diagram of the emission shaft of tested optical communication terminal Laser Output Beam;

Fig. 3 is the principle schematic that becomes the some picture on the imaging surface of ccd detector.

Embodiment

Embodiment one: below in conjunction with Fig. 1 to Fig. 3 this embodiment is described, the described measuring method of this embodiment is:

Block prism 1 is adhered on the mechanical reference surface of tested optical communication terminal 2; Make the front-reflection face of block prism 1 parallel with the mechanical reference surface of tested optical communication terminal 2; Adopt autocollimator 3 its precision to be had the words of requirement; Please provide parameter emission laser beam, make said laser beam after semi-transparent semi-reflecting lens 4 reflections, incide the front-reflection face of block prism 1, through the angle of adjustment autocollimator 3; Folded light beam and its incident beam through the reflection of the front-reflection face of block prism 1 are coincided, determine the mechanical reference surface axis of tested optical communication terminal 2;

The light beam of said block prism 1 reflected back is through semi-transparent semi-reflecting lens 4 transmissions, and assembles the back through long focus lens 5 and on ccd detector 6, become a some picture, writes down the facula position reading first time of ccd detector 6, and closes autocollimator 3;

Control the laser instrument 2-1 output beam of tested optical communication terminal 2 then, the output beam of said laser instrument 2-1 becomes some picture, the facula position reading second time of record ccd detector 6 on ccd detector 6 after long focus lens 5 is assembled;

Twice facula position reading according to ccd detector 6 calculates, and emission shaft and the said mechanical reference surface that obtains tested optical communication terminal 2 laser instrument 2-1 output beams is at the angle of azimuth direction with at the angle of pitch orientation.

This embodiment provides a kind of succinct space optical communication terminal Laser emission axle and the accurate measurement method of mechanical reference surface angle.Block prism 1 is adhered on the mechanical reference surface of tested optical communication terminal 2, then the front-reflection face of block prism 1 is parallel with mechanical reference surface; Angle through adjustment autocollimator 3; The folded light beam of semi-transparent semi-reflecting lens 4 and the light beam of block prism 1 reflected back are coincided; This moment incides the light beam of long focus lens 5 and the axis of said mechanical reference surface coincides, and has promptly confirmed the mechanical reference surface axis of tested optical communication terminal 2.

Embodiment two: below in conjunction with Fig. 1 and Fig. 2 this embodiment is described, this embodiment is for to the further specifying of embodiment one, and said ccd detector 6 is positioned on the focal plane of long focus lens 5.

Embodiment three: this embodiment is described below in conjunction with Fig. 3; This embodiment is further specifying embodiment one or two; Said twice facula position reading according to ccd detector 6 carries out Calculation Method and is: set ccd detector 6 the first time facula position reading for (X0, Y0), the facula position reading is (X1 for the second time; Y1), the emission shaft and the said mechanical reference surface that calculate tested optical communication terminal 2 laser instrument 2-1 output beams in the angle of azimuth direction are:

$\mathrm{\α}=\frac{X1-X0}{f},$ F is the focal length of long focus lens 5 in the formula;

The emission shaft and the said mechanical reference surface of tested optical communication terminal 2 laser instrument 2-1 output beams at the angle β of pitch orientation are:

$\mathrm{\β}=\frac{Y1-Y0}{f}.$

Claims (3)

1. measuring method based on the Laser emission axle and the mechanical reference surface angle of block prism, it is characterized in that: its measuring method is:

Block prism (1) is adhered on the mechanical reference surface of tested optical communication terminal (2); Make the front-reflection face of block prism (1) parallel with the mechanical reference surface of tested optical communication terminal (2); Adopt autocollimator (3) emission laser beam; Make said laser beam after semi-transparent semi-reflecting lens (4) reflection, incide the front-reflection face of block prism (1); Through the angle of adjustment autocollimator (3), folded light beam and its incident beam through the reflection of the front-reflection face of block prism (1) are coincided, determine the mechanical reference surface axis of tested optical communication terminal (2);

The light beam of said block prism (1) reflected back is through semi-transparent semi-reflecting lens (4) transmission, and assembles the back through long focus lens (5) and on ccd detector (6), become a picture, writes down the facula position reading first time of ccd detector (6), and closes autocollimator (3);

Control laser instrument (2-1) output beam of tested optical communication terminal (2) then, the output beam of said laser instrument (2-1) becomes a picture on ccd detector (6) after long focus lens (5) is assembled, the facula position reading second time of record ccd detector (6);

Twice facula position reading according to ccd detector (6) calculates, and emission shaft and the said mechanical reference surface that obtains tested optical communication terminal (2) laser instrument (2-1) output beam is at the angle of azimuth direction with at the angle of pitch orientation.

2. the measuring method of Laser emission axle and the mechanical reference surface angle based on block prism according to claim 1, it is characterized in that: said ccd detector (6) is positioned on the focal plane of long focus lens (5).

3. the measuring method of Laser emission axle and the mechanical reference surface angle based on block prism according to claim 1 and 2; It is characterized in that: said twice facula position reading according to ccd detector (6) carries out Calculation Method and be: the facula position reading first time of setting ccd detector (6) is (X0; Y0); The facula position reading is (X1 for the second time; Y1), the emission shaft and the said mechanical reference surface that calculate tested optical communication terminal (2) laser instrument (2-1) output beam in the angle of azimuth direction are:

$\mathrm{\α}=\frac{X1-X0}{f},$ F is the focal length of long focus lens (5) in the formula;

The emission shaft and the said mechanical reference surface of tested optical communication terminal (2) laser instrument (2-1) output beam at the angle β of pitch orientation are:

$\mathrm{\β}=\frac{Y1-Y0}{f}.$

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